Christina wasn’t saying anything, but the professor smiled at her _______she had done something very...
2022-12-25 19:43:32 102次 2012-2013学年湖南省高一第三次月考英语试卷（解析版） 反馈错误 加入收藏 正确率 : 100%
题目内容：
Christina wasn’t saying anything, but the
professor smiled at her _______she had done something very clever.
A. as
if
B. now that C.
while D. though
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